Pressure fluid motor



M y 1935- E G. GARTIN 2,040,843

' PRESSURE FLUID MOTOR Filed Sept. 9, 1932 fig v Patented May 19, 1936 UNITED STATES PATENT OFFICE PRESSURE FLUID MOTOR Elmer G. Gartin, Olaremont, N. H., assignor to Sullivan Machinery Company, a corporation of Massachusetts Thisrinvention relates to pressure fluid motors and more particularly to improvements in the fluid distribution means and associated hole blowing means for a pressure fluid motor of the type particularly adapted to use in rock drilling tools.

An object of this invention is to provide an improved pressure fluid motor. Another object is to provide an improved pressure fluid motor particularly adapted to use in rock drilling tools. A further object is to provide an improved fluid distribution means for a pressure fluid motor. Yet another object is to provide an improved valve mechanism fora pressure fluid motor. A still further object is to provide an improved fluid distribution means for a pressure fluid motor particularly adapted to use in rock drilling tools and having associated therewith improved hole blowing means. These and other objects will, however, subsequently more fully appear. V

In the'accompanying drawing there is shown for purposes of illustration one form which the invention may assume in practice.

In this drawing,

Fig. 1 is a central longitudinally extending sectional view of the illustrative embodiment of the improved pressure fluid motor.

Fig. 2 is a view similar to Fig. 1 showing the valve and motor piston in a different position.

Fig. 3 is a view similar to Fig. 1 showing the hole blowing valve and motor piston in hole blowing position.

In this illustrative construction there is shown a motor cylinder I herein composed of a plurality of sections united together and having formed therein a cylinder bore 2 containing a reciprocable motor piston 3. As is usual in rock drilling motors, the piston 3 is provided with a forwardly projecting cylindrical extension or striking bar 4 guided within a reduced bore 5 formed in the front motor head 6, and this extension or striking bar is adapted to deliver a series of impact blows to the shank of a usual hollow drill steel suitably mounted within the front motor head. Formed in the extension or striking bar 4 is a series of longitudinal grooves 1 for conducting pressure fluid, when the motor .piston is in its rearward position. from the forward end of the cylinder through the front motor head and thence to the bore in the drill steel through which fluid is conducted to the bottom of the drill hole to blow out the cuttings from the hole in a well known manner. e

kThe improved fluid distribution means comprises an annular valve chamber 8 surrounding the cylinder bore substantially intermediate the ends of the cylinder and formed in the cylinder element 9. Arranged within the valve chamber for reciprocatory movement is an annular flat .5 ing type or disc valve Ii] guided at H on an element of the improved hole blowing means, as hereinafter described. Fluid is supplied to the valve chamber through a supply connection I2 and passage l3. Formed in the opposite sides of .10 the valve chamber are annular grooves 14' and l5 and the groove I4 is connected through a supply passage Hi to the rear end of the cylinder bore, while the groove 15 is .connected to the forward end of the cylinder bore through a supl5 ply passage H. The valve is arranged substantially intermediate the ends of the cylinder, and the supply passages l6 and I! are of substantially the same length. Communicating with the cylinder. bore substantially intermediate the 1 ends thereof is a series of piston controlled exhaust ports I8.

In the operation of the improved fluid distribution means when the parts are in the position shown in Fig. 1, pressure fluid may flow through A supply connection [2 and passage l3 to the valve chamber 8. When the valve In is in the position shown, the front surface of the valve is seated .on concentric annular seats surrounding the groove 15, cutting ofi communication between the A supply passage l3'and the passage l'L'and pressure fluid at this time flows through the valve chamber 8 .past the rear surface of the valve through groove 14 and passage I6 to the rear end of the cylinder'b'o're, the pressure acting on the 3 rear pressure area of the motor piston to drive the latter forwardly to effect its working stroke.

At this time, the forward end of the cylinder bore edge of the piston head overruns the passages l8,

the rear end of the cylinder bore is connected to exhaust through passages I8. and as a result the pressure within the rear end of the cylinder bore 5 V and passage I6 and groove I4 at the rear side of the valve is substantially reduced. Consequently the valve I0 is thrown from the position shown in Fig. 1 by the relatively highcompression pressure overcoming the piston controlled reduced pressure acting on the opposed area of the valve, to the position shown in Fig. 2. When the valve I is in the position shown in Fig. 2, the rear surface of the valve is seated against the concentric annular surfaces surrounding the annular groove I74, cutting off communication between the valve chamber and passage l6. At this time pressure fluid flows through supply connection l2, passage .to effect its retraction stroke.

I3, through the valve chamber, past the forward surface of the valve, through groove I5 and passage H, to the forward end ofthe cylinder bore,

the pressure acting on the forward pressure area of the motor piston to drive the latter rearwardly At this time, the rear end of the cylinder bore is exhausted through exhaust passages l8. As the piston travels rear- .wardly the exhaust passages I8 are covered by the piston head, and as a result, upon continued rearward movement of the piston a substantial compression pressureis built up by the piston within the rear end of the cylinder bore and passage. l6 and groove M at the rear side of the valve; As, the forward edge of the piston head overruns the exhaust passage l8 the forward end of the cylinder bore is connected to exhaust through exhaust passages I8, and as a result the V pressures act will be varied to suit conditions'to be met. e V

r The improved hole blowing means associated with .the fluid distribution means herein comprises a sleeve valve 20 reciprocably mounted in a valve chamber 2| encircling the cylinder bore and formed between the bore in the cylinder element 9 and the sleeve-like portion 22 of the cylinder element23. The fluid distributing valve I0 is reciprocably mounted on the exterior" of the sleeve valve 20. Guidedin a bore 24 formed in thecylinder element9 is a plunger valve 25 having a manually operable push button 26, and this valve is normally held in its released position by a coiled spring 21. When in its inward position this valve closes the throwing passage l6. Formed in the cylinder element 9 is a' passage 28 connecting the bore 24 with the fluid supply connection I2, and a passage 29 connecting the bore 24 with the rear end of the valve chamber 2|; and formed in the plunger valve 25 is a groove 30 for connecting, when the valve is in its inner position as 7 shown in Fig. 3, the passage 28 with the passage 29. When the plunger valve is released, communication between the passages 28 and 29 is cut off by the cylindrical portion of the valve 25.

In the operation of'the'improved hole blowing means, when it is desired to effect a hole blowing operation, that is to supply a continuous flow of sage 29 to the valve chamber 2| toact on the rearpressure area of the sleeve valve 20, moving J the latter forwardly from the position shown in Fig. 1 to the position shown in Fig. 3, the sleeve valve at this time closing the motor cylinder exhaust passages l8. The pressure fluid flowing from the supply connection l2 through passages l3 and 1 causes the motor piston to be retracted, holding the same immovable in its rearmost position, and as a result a continuous supply of pressure fluid is conducted from the forward end of the cylinder bore through the grooves I in the piston striking bar and thence through the, bore in the drill steel to the bottom of the drill hole. When the plunger valve is released, the valve 20 is automatically returned to the position shown in Fig. 1 by the pressure acting on the forward pressure area of the valve, there being suflicient leakage between the parts to prevent a substantial pressure from being built up in the valve chamber 2| at the rear side of the valve 20.

As a result of this invention, it will be noted that an improved pressure fluid motor is provided having improved fluid distribution means whereby the flow of pressure fluid to the opposite ends of the motor cylinder are substantially equally distributed, the fluid distributing valve being arwill further be noted that associated with the im-' proved fluid distribution means is improved hole blowing means whereby a hole blowing operation.

is effected in an extremely simple and effective manner. These and other advantages of the im proved pressure fluid motor will be clearly apparent to those skilled in the'art.'

While there is in this application specifically described one form which the invention'may assume in practice, it will be understood that this form of the same is shown for purposes of illustration and that the invention may be modified and embodied in various other forms without departing from its spirit or the scope of the appended'claims.

What I claim as new and desire to secure by Letters Patent is: i 5

1. In a pressure fluid motor,'a cylinder having exhaust means, a piston reciprocable in said cylinder for controlling said exhaust means, fluid distribution means for conducting pressure fluid to the opposite ends of the cylinder to effect 'recipro'cation' of the piston and including an annular fluid distributing valve encircling the motor cylinder, and a hole blowing device associated withsaid fluid distribution means and including an exhaust control valve for closing said exhaust means, said exhaust control valve encircling the motor cylinder and said distributing valve guided thereoni i 1 2. In a pressure fluid motor, a cylinder having exhaust means, a piston reciprocable in said cylinder for controlling said exhaust means, fluid distribution means for conducting pressure fluid to the opposite ends of the cylinder to efi'ect reciprocation of the piston and including an annular fluid distributing valve encircling the motor cylinder, and a hole blowing device associated with said fluid distribution means and including a pressure fluid actuated exhaust control valve for closing said exhaustm'ean's and a valve operable at will for controlling the 'supply of pressure fluid to said exhaust control valve, said exhaust control valve encircling the motor cylinder and said distributing valve guided thereon.

' l 3. In a pressure fluid motor, a cylinder having exhaust means, a piston reciprocable in said cylinder for controlling said exhaust means, fluid distribution means for conducting pressure fluid to the opposite ends of the cylinder to effect reciprocation of the piston and including an annularfluid distributing valve encircling themotor cylinder, a hole blowing device associated with said fluid distribution means and, including a pressure fluid actuated exhaust control valve for closing said exhaust means, said exhaust control valve encircling the motor cylinder and said distributing valve guided thereon, and manually operable valve means for supplying pressure fluid to said exhaust control valve for shifting the latter from its released position to its operative hole blowing position.

4. In a pressure fluid motor, a cylinder having a piston controllable exhaust, a piston reciprocable in said cylinder, a fluid actuated distributing valve, passage means for conducting throwing pressure to said valve, a pressure actuatable exhaust controlling valve, and a common valve member movable to close a throwing passage and to govern fluid supply to said exhaust controlling valve.

5. In a pressure fluid motor, a cylinder having exhaust means, a piston reciprocable in said cylinder for controlling said exhaust means, fluid distribution means for conducting pressure fluid to the opposite ends of the cylinder to effect reciprocation of the piston including a fluid supply passage and a fluid distributing valve for controlling said passage, and a hole blowing device associated with said fluid distribution means and including a fluid actuated exhaust control valve for closing said exhaust means and a valve oper-,

able at will for controlling the flow of fluid through said supply passage to the cylinder independently of said distributing valve and for effecting actuation of said exhaust control valve.

6. In a pressure fluid motor, a cylinder having,

exhaust means, a piston reciprocable in said cylinder for controlling said exhaust means, fluid distribution means including supply passages for conducting pressure fluid to the opposite ends of the cylinder to effect reciprocation of the piston,

and a hole blowing device associated with said fluid distribution means and including a pressure fluid actuated exhaust control valve for closing said exhaust means, said exhaust control valve encircling the motor cylinder, and a cooperating valve operable at will for cutting off fluid flow through one of said supply passages and for effecting actuation of said exhaust control valve.

'7. In a pressure fluid motor, a cylinder having a piston controllable exhaust, a piston reciprocable in said cylinder, a fluid actuated distribut-v ing valve, passage means controlled by said fluid actuated distributing valve for conducting pressure fluid to the opposite ends of said cylinder, a pressure actuatable exhaust controlling valve, and a common valve member movable to close directly one of said fluid conducting passage means independently of said distributing valve and to govern fluid supply to said exhaust controlling valve.

8. In a pressure fluid motor, a cylinder having exhaust means, a piston reciprocable in said cylinder for controlling said exhaust means, fluid distribution means for conducting pressure fluid to the opposite ends of the cylinder to effect reciprocation of the piston and including an automatic fluid distributing valve for controlling the flow of pressure fluid to the cylinder ends, and a hole blowing device associated with said fluid distribution means and including a fluid actuated exhaust control valve for closing said exhaust means and a cooperating valve operable at'will for directly cutting off the supply of pres- .sure fluid to one end of said cylinder independently of. said distributing valve and for effecting actuation of said exhaust control valve.:

9. In a pressure fluid motor, a cylinder having exhaust means, a piston reciprocable in said cylinder for controlling said exhaustmeans, fluid distribution means including supply passages for conducting pressure fluid to the opposite ends of said cylinder to effect reciprocation of said piston and-an automatic fluid distributing valvecontrolling fluid flow through said supply passages, and a hole blowing device associated with said fluid distribution means and including a pressure fluid actuated exhaust control valve for closing said exhaust means and a cooperating valve operable at will for directly cutting off fluid flow through one of said supply passages to one end of said cylinder independently of said distributing valve and for effecting actuation of said exhaust control valve.

10. In a pressure fluid motor, a cylinder having exhaust means, a piston reciprocable in said cylinder for controlling said exhaust means, fluid distribution means for. conducting pressure fluid to the opposite ends of the cylinder to effect reciprocation of the piston and including an automatic fluid distributing valve for controlling fluid flow to the cylinder ends, and a hole blowing device associated with said fluid distribution means and including a pressure fluid actuated exhaust control valve for closing said exhaust means and manually operable valve means for supplying pressure fluid to said exhaust control valve. for shifting the latter from its released position to its operative hole blowing position and for interrupting normal operation of said fluid distribution means by cutting off the flow of pressure fluid to one end of said cylinder independently of said distributing valve.

11. In a pressure fluid motor, a cylinder having exhaust means, a piston reciprocable in said cylinder for controlling said exhaust means, fluid distribution means for conducting pressure fluid to the opposite ends of the cylinder to efiect reciprocation of the piston and including a fluid distributing valve, and a hole blowing device associated with said fluid distribution means including an exhaust control valve for closing said exhaust means, said exhaust control valve providing means for guiding said distributing valve.

12. In a pressure fluid motor, a cylinder having exhaust means, a piston reciprocable in said cylinder for controlling said exhaust means, fluid distribution means for conducting pressure fluid to the opposite ends of the cylinder to effect reciprocation of the piston and including a fluid distributing valve, a hole blowing device associated with said fluid distribution means and including a pressure fluid actuated exhaust control valve for closing said exhaust means, said exhaust control valve providing means for guiding said fluid distributing valve, and manually operable valve means for supplying pressure fluid to said exhaust control valve for shifting the latter from its released position to its operative hole blowing position.

13. In a pressure fluid motor, a cylinder having a piston controlled exhaust, a piston reciprocable in said cylinder, a fluid actuated distributing valve, passage means for conducting pressure fluid under control of said fluid actuated distributing valve to the opposite ends of said cylinder, an exhaust controlling valve for closing said cylinder exhaust, and valve means movable to close thecylinderand an automatic fluid distributing valve for controlling fluid flow through said supply passage, and a hole blowing device associated with said fluid distribution means and including an exhaust control valve for closing said exhaust means and a valve operable at will for controlling the flow of fluid through said supply passage to the cylinder independently of said distributing valve and for effecting actuation or said exhaust control valve into its exhaust closing position. V a 7 l 15. In a pressure fluid motor, a cylinder having a piston controlled exhaust, a piston reciprocable in said cylinder, fluid'distribution means for supplying pressure fluid to the cylinder to efiect'reciprocation of the piston including a fluid actuated fluid distributing valve for controlling fluid flow to the cylinder ends, passage means for conducting'throwing pressureto said valve, 'an exhaust controlling valve forclosingsaid cylinder exhaust, and common control means operable to eflect closure of a throwing passage to interrupt valve movement and to efiect movement of said exhaust controlling valve into its exhaust closing position.

ELMER G. GARTIN. 

